<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <select v-model="selected" multiple>
        <option>html</option>
        <option value="js">javascript</option>
        <option>css</option>
    </select>
    <p>choose radio is {{selected}}</p>

</div>

<!--  <script src="E:\idea_workspace\study\vue\vue.min.js"></script>-->
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>

<script>
    var app = new Vue({
        el: '#app',
        data: {
            selected: ['html','js']
        },

    })
</script>

</body>
</html>